這個圖片上傳主要實現用戶實名認證，截取字符串有點繁瑣，有任何建議，歡迎評論提出。

1.首先引入一個jar包

org.springframework.web.multipart;

2.開始上傳圖片，以文件流接收

package com.qianmo.qmyj.controller;

import com.qianmo.qmyj.bean.dto.UserInfo;
import com.qianmo.qmyj.bean.request.FindMsgRequest;
import com.qianmo.qmyj.bean.request.FindOneMessageRequest;
import
 
 com.qianmo.qmyj.bean.response.FindMsgResponse;
import com.qianmo.qmyj.bean.response.FindOneMessageResponse;
import com.qianmo.qmyj.common.Constants;
import com.qianmo.qmyj.framework.util.DataVerifyUtil;
import com.qianmo.qmyj.service.UserInfoExecuteService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import
 
 org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * 圖片上傳
 * */
@Controller
@RequestMapping(value = "/UploadImageController")
public class UploadImageController extends BaseController {

    Logger logger = LoggerFactory.getLogger(UploadImageController.class);
//    @Resource
//    MsgService msgService;

    @Resource
    private UserInfoExecuteService userInfoExecuteService;

    /*
   *    上傳圖片；
   * */
    @ResponseBody
    @RequestMapping(value = "/upload",method = RequestMethod.POST)
    public Map upload(@RequestParam(value = "imgPath") MultipartFile multipartFile,String userId,String imgType, HttpServletRequest request){
        logger.info("——————進入上傳圖片接口");
        Map map=new HashMap();　　　　　　//IdCard是項目中的文件目錄，會自動存到本地項目裏
        String upload=request.getRealPath("/IdCard/"+ multipartFile.getOriginalFilename());
        logger.info("——————進入上傳圖片接口，upload："+upload);

        //截取圖片名稱前面的字符串
        String imgIdCardPath = upload.substring(upload.indexOf("D"),upload.lastIndexOf("m")-1);
        logger.info("——————截取圖片名稱前面的字符串，imgIdCardPath："+imgIdCardPath);
        //截取圖片名稱後面的字符串
        String imgIdCardPath2 = upload.substring(upload.indexOf("C")+5,upload.length());
        logger.info("——————截取圖片名稱後面的字符串，imgIdCardPath2："+imgIdCardPath2);
        Date d=new Date();
        long timeStr=d.getTime();
        if (imgType.equals("0")){
            upload = imgIdCardPath +"face"+ String.valueOf(timeStr)+imgIdCardPath2;
        }else if(imgType.equals("1")){
            upload = imgIdCardPath +"crtA"+ String.valueOf(timeStr)+imgIdCardPath2;
        }else if(imgType.equals("2")){
            upload = imgIdCardPath +"crtB"+ String.valueOf(timeStr)+imgIdCardPath2;
        }

        logger.info("——————upload，upload："+upload);
        //截取圖片存入數據庫
        String imgPath=upload.replaceAll("\\\\","/");
        imgPath = imgPath+"0";
        imgPath = imgPath.substring(imgPath.indexOf("I"), imgPath.lastIndexOf("0"));
        logger.info("——————imgPath，imgPath："+imgPath);

        //   System.out.println(str.substring(str.indexOf(">")+1, str.lastIndexOf("<"))); 截取指定兩個字符之間的字符

        UserInfo cust=userInfoExecuteService.findOneUserStr(userId);
        logger.info("——————cust："+cust);
        if (imgType.equals("0")){//0代表頭像

            File folder = new File(imgIdCardPath);
            File[] files = folder.listFiles();//如果圖片存在，則刪除
            String str1=cust.getUserFaceImg().substring(cust.getUserFaceImg().indexOf("/")+ Constants.score.one, cust.getUserFaceImg().length());
            if (null !=files) {
                for (File file : files) {
                    if (file.getName().equals(str1)) {
                        file.delete();
                        break;
                    }
                }
            }
            /*if (!"".equals(cust.getUserFaceImg())||null!=cust.getUserFaceImg()){//如果圖片存在，則刪除
                logger.info("——————如果圖片存在，則刪除：刪除！");
                clearFiles(upload);
            }*/
            //獲取絕對相對路徑
            //文件上傳到指定路徑；
            try {
                UserInfo userInfo = new UserInfo();
                userInfo.setUserId(userId);
                userInfo.setUserFaceImg(imgPath);
                int count = userInfoExecuteService.updateUserImage(userInfo);//修改頭像
                logger.info("——————修改頭像，count："+count);
                UserInfo customer=userInfoExecuteService.findOneUserStr(userId);//獲取最新工人對象
                logger.info("——————獲取最新工人對象，customer："+customer);
                multipartFile.transferTo(new File(upload));
                logger.info("——————上傳頭像成功，multipartFile："+upload);
                //使用給map添加數據並返回；
                map.put("code","0000");
                map.put("imagePath",imgPath);
                map.put("customer",customer);
                map.put("message","上傳成功！");
                return map;
            }catch (Exception e){
                map.put("code","1111");
                map.put("message","頭像");
                map.put("message","上傳失敗！");
                return map;
            }
        }else if (imgType.equals("1")){//1代表身份證正面照
            File folder = new File(imgIdCardPath);
            File[] files = folder.listFiles();//如果圖片存在，則刪除
            String str1=cust.getIdCardPositiveImg().substring(cust.getIdCardPositiveImg().indexOf("/")+ Constants.score.one, cust.getIdCardPositiveImg().length());
            if (null !=files) {
                for (File file : files) {
                    if (file.getName().equals(str1)) {
                        file.delete();
                        break;
                    }
                }
            }
            /*if (!"".equals(cust.getIdCardPositiveImg())||null!=cust.getIdCardPositiveImg()){//如果圖片存在，則刪除
                clearFiles(upload);
            }*/
            //獲取絕對相對路徑
            //文件上傳到指定路徑；
            try {
                UserInfo userInfo = new UserInfo();
                userInfo.setUserId(userId);
                userInfo.setIdCardPositiveImg(imgPath);
                int count = userInfoExecuteService.updateUserImage(userInfo);//修改頭像
                multipartFile.transferTo(new File(upload));
                //使用給map添加數據並返回；
                map.put("code","0000");
                map.put("imagePath",imgPath);
                map.put("message","上傳成功！");
                return map;
            } catch (Exception e) {
                e.printStackTrace();
                map.put("code","1111");
                map.put("CardPicture2","身份證正面");
                map.put("message","上傳失敗！");
                return map;
            }
        }else if (imgType.equals("2")){//2代表身份證反面照
            File folder = new File(imgIdCardPath);
            File[] files = folder.listFiles();//如果圖片存在，則刪除
            String str1=cust.getIdCardNegativeImg().substring(cust.getIdCardNegativeImg().indexOf("/")+ Constants.score.one, cust.getIdCardNegativeImg().length());
            if (null !=files) {
                for (File file : files) {
                    if (file.getName().equals(str1)) {
                        file.delete();
                        break;
                    }
                }
            }
            /*if (!"".equals(cust.getIdCardNegativeImg())||null!=cust.getIdCardNegativeImg()){//如果圖片存在，則刪除
                clearFiles(upload);
            }*/
            //獲取絕對相對路徑
            //文件上傳到指定路徑；
            try {
                UserInfo userInfo = new UserInfo();
                userInfo.setUserId(userId);
                userInfo.setIdCardNegativeImg(imgPath);
                int count = userInfoExecuteService.updateUserImage(userInfo);//修改頭像
                multipartFile.transferTo(new File(upload));
                //使用給map添加數據並返回；
                map.put("code","0000");
                map.put("imagePath",imgPath);
                map.put("message","上傳成功！");
            } catch (Exception e) {
                e.printStackTrace();
                map.put("code","1111");
                map.put("CardPicture2","身份證反面");
                map.put("message","上傳失敗！");
                return map;
            }
        }else{
            map.clear();
            map.put("code","1111");
            map.put("message","圖片上傳失敗，類型請選擇0（頭像）,1（身份證正面照）,2（身份證反面照）");
            return map;
        }
        return map;
    }

    @ResponseBody
    @RequestMapping(value = "/findMsg",method = RequestMethod.POST)
    public FindMsgResponse findMsg(FindMsgRequest request){
        return userInfoExecuteService.findMsgList(request);
    }

    /***
     * 查詢單個消息
     * @param request
     * @return
     */
    @ResponseBody
    @RequestMapping(value = "/findJupsh",method = RequestMethod.POST)
    public FindOneMessageResponse findOneMsg(FindOneMessageRequest request){
        return userInfoExecuteService.findOneMsg(request);
    }

    /***
     * 查詢所有消息
     * @param request
     * @return
     */
    @ResponseBody
    @RequestMapping(value = "/findAllJupsh",method = RequestMethod.POST)
    public FindMsgResponse findOneMsg(FindMsgRequest request){
        return userInfoExecuteService.findMsgList(request);
    }
}

自己引入jar包實現的圖片上傳